Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d3ab4da128a6d…

MALICIOUS

PDF

91.0 KB Created: 2021-09-03 17:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1a53425e2f0479889a76df5e9d6ae35 SHA-1: 30df6bf2f2e83999f1f0acd715e2edf0fca8db1a SHA-256: b79d3ab4da128a6d4713a26102fca9a27c28dddc1daf9287b21f31c63625edee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=washington+dc+national+mall+map+pdf PDF link annotation
    • http://biotop-zamosc.pl/userfiles/file/xagoguvenajoneje.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aebce6cfa20---darerogev.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lavimufuweboduwij.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r6gantt0dca491vin3qh1iqlv1/29945791090.pdfIn PDF document text
    • https://zhansq.cn/upload/file/bujututigevaliralit.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/danura.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/vuvuvo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/3698506206091df897a147.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210614141030.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c9f03ce4---30418561602.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d38b0a23a1879778d1ec718fba984902/nemibo.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/59262891146.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/289fa6669b08b650cb94302b6cc851d4/didixajile.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f8189488b49378fdd3a8a7caaba0d766/17159876503.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/25858025921.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766608e378c---vapax.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/93412817408.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/samebirarinakidoma.pdfIn PDF document text
    • https://windsbs.biz/files/file/6489683382.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bb342a8d---pufefinenojusijemoroxolun.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/60264198235.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/448f360ebeca79a40ce4fe5290a4bb64/jexapaxuk.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/25957699576.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be45742903c---93479241539.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/duliwesufapakifopetaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 18804 bytes
SHA-256: 66a29eacb5c9bff6a3a3d32a788ca89d465eea8a6ae63f323dbeba287dd71a2e
font_01_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 10828 bytes
SHA-256: 5b8152c97fbe1288df51e46908b4bc98f0836c739f1d2fbc9e15ec8e9138aabe
font_03_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 18512 bytes
SHA-256: 81f85cca989b303b04fe961cbf425f918456a061e2a3a158ddf275b54ee96054

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